Mitchell Defense The DOC AR-15 .300 BLK 7.5in Upper Receiver Chrome-Moly Barrel Black Finish M-LOK Free-Float Handguard. 5in .300 Blackout Upper Receiver is built for compact maneuverability and reliable suppressed performance. The 7075-T6 billet upper receiver features Mitchell Defense's thermal-fit barrel seat to reinforce structural integrity and improve accuracy under rapid firing. Its 7.5in barrel is optimized for close-quarters performance offering balanced rigidity and consistent terminal effect with subsonic and supersonic loads. An adjustable gas block comes standard allowing precise tuning for suppressed and unsuppressed use. The ArmorLube Carbon Cutter BCG with a Carpenter 158 HP/MPI bolt ensures smooth durable cycling with reduced carbon fouling paired with a free-float M-LOK handguard for lightweight modularity. Finished in E-Series Cerakote this upper is ideal for compact defensive builds and suppressed applications. Specifications for Mitchell Defense The DOC AR-15 .300 BLK 7.5in Upper Receiver: Manufacturer: Mitchell Defense Caliber: .300 AAC Blackout Overall Length: 16.2 in Barrel Length: 7.5 in Barrel Profile: Standard Gas System Length: Pistol Length Barrel Twist Rate: 1-5 Threads per Inch: Non Threaded Muzzle Device: A2 Flash Hider Finish: Nitride Color: Black Gun Model: AR-15 Fabric/Material: 4150 CrMoV Gun Make: AR Platform Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Features of Mitchell Defense The DOC AR-15 .300 BLK 7.5in Upper Receiver Adjustable gas block for tuning subsonic and supersonic loads 7075-T6 billet upper with thermal-fit barrel seat for improved rigidity ArmorLube Carbon Cutter BCG with C158 HP/MPI bolt for maximum reliability Lightweight free-float M-LOK handguard for accessory flexibility Package Contents: Mitchell Defense The DOC AR-15 .300 BLK 7.5in Upper Receiver What firearm models does the manufacturer say Mitchell Defense The DOC AR-15 .300 BLK 7.5in Upper Receiver is compatible with? The manufacturer suggests that Mitchell Defense The DOC AR-15 .300 BLK 7.5in Upper Receiver is compatible with AR-15Mitchell Defense 411121: The DOC AR-15 .300 BLK 7.5in Upper Receiver Chrome-Moly Barrel Black Finish M-LOK Free-Float Handguard